Panoramic telescope.



35o-445 SR OR egangg M n EDraftsman.

. No. 882,763. v PUBMED MAR. 24, 190s.

H. JAcofB.

PANORAMIG TELBSGOPE. YPLIULTIOI FILED JULY 16. 1907.

45 sus 1 i e FFII:- kownV rism reversing 'k with each other in suc amanner that'lthegflOO p systems 1n all cases wi ere tee latter o Iy r6"-angularspeed of the pinion 'i is half that'f offfj verse" u a e in onesense. :The n he pinion 7c, as is the case when the ordinary Yerectingprisms are used in the known vinll;` i l struments. i t P.;

" Having y now particularly described and 20 pairs so that the focal 30cylinders.

UNITEI) STATES PATENT OFFICE.

HEINRICH JACOB, OF STEGLITZ, NEAR BERLIN, GERMANY, ASSIGNOR TO THE FIRMOF OPTISGHE ANSTALT C. P. GOERZ AKTIENGESELLSCHAFT, OF FRIEDENAU, NEARBER- LIN, GERMANY.

- PANORAMIC TELESICOPE.

in only one sense relatively to the objects which they represent, thatis to say, pictures in which either only the sides are reversed(riO'ht-hand and left-hand) or only the top and bottom.

The'improved reversino system comprises pairs of optical systems a a tedto focus in a straight hne pencils of para lel rays entering the system.If optical'systems having this property are placed opposite each otherin es of pencils of parallel rays coincide with each other, the raysforming a parallel pencil are, after assing through one of these pairs,still para lel but have changed sides.

The so-called cylindrical lenses are known to form optical systemsadapted to focus pencils of parallel rays in one line; cylindricallenses are lenses curved only in one sense so that their curved contoursare segments of The elements of each pair of c lindrical lenses may ofcourse be individually composed of several lenses. As a rule it isadvisable to form each pair of cylindrical lenses of elements of equalfocal length, in

order to avoid the distortion of the image which is inseparable fromenlargements or reductions obtained with combinations of lenses of thistype.l The employment of ele- 4ments of different focal lengths in apair of 40 cylindrical lenses is, of course, not precluded,

and would be adopted where it isv desiredto obtain distortion ywhichcircles are made to appear as ellipses, or vice-versa. .Ef' T e newreversingL system can be used as'a Specication of Letters Patent.

Application led July 16, 1907.

Patented March 24, 1908.

Serin Nu. 383,953.

is secured with regard to the size of the free aperture of the reversingsystem, since the' size of the glass bodies forming the erecting prismsno longer comes into consideration.

The invention is illustrated in thev annexed drawing..

Figures l and 2 diagrammatically illus-A tratethe new reverslnff systemin its simplest form, by means o two sections whichY are respectivelynormal and parallel to the focal line. The system in 'this case comrisestwo cylindrical lenses a and b of equal 'ocal length. The focal line ofthe two lenses is marked c. The ray aths indicated in the gures showthat para lel ra s falling upon one lens in a plane perpendicu ar to thefocal line are parallel when passing out of the other lens, but havechanged sides.V Rays fallin u on one of the lenses in a lane parallelwit t e focal line pass throug the second lens Without intersecting eachother. It is, therefore, clear that the system only produces a-reversalin one sense, by interchanging the right-hand and left-hand sides,

or the top and the bottom. The space between the two lenses shown in Fis. 1 and 2 may, of course, contain additiona lenses or bodies of glass,and the entire reversing s stein may consist of a single block of lass,t e two optically active surfaces of whic are seo'ments of c linders.

ig. 3 is a diagrammatic axial section of a panorama-telescope rovidedwith the new reversing system. he rotatable receivin reflector of the'panorama-telescope is marke d, and the elements of the reversing systemare in this case also simple cylindrica lenses, are marked e and j;- theC(liljective lens is marked g. The lenses e an reversing system arearranged in a support h Of the common to both and rovided with a pin- 3vion i. The support of t e receiving reflector d is provided with apinion 7c. Pinions l and ,m fixed to an axle n cou le the pinions i andj e. eversing system insteadiof ythe 1.`- Anzimage-reversingsystemrcomprising 55 usual erecting prismggreater inde endeneeplurahtyof e@ f y remedrendereammiraticlaimen.; Y "'Jtiie new i focuspencils of parallel rays in a single line, said o tical systems beingarranged 1n airs insuc relation to each other that the ocal lines ofeach pair coincide with each other.

2. An image-reversing systemA comprising at least one pair ofcylindrical lenses the lenses of each pair being placed relatively to anuage-reversing s stem comprising' at least' one pair of optica s stemsa a te in a single line pene' s of parallelrays.

5. In a anorama-telescope a rotatable receivin re ector and at least onepair of cylindrical` enses inserted in the rayath of the instrument andso coupled with t e receiving reflector that they move at half theangular speed of the reflector, the elements of each pair of cylindricallenses being so placed opposite each other that their'focal cide.

In testimony whereof have signed this specicatlon m the presence of twosubscribing Witnesses.

HEINRICH JACOB.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

to focus

